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The ATC requests from a helicopter Pilot to descend from a cruise altitude at 7 000 ft to a lower cruise altitude at 5 500 ft, due to air traffic. If the Pilot decides to descend with a constant Rate of Climb of 650 ft/min, how long will it take to reach at 5 500 ft?
  • A
    2 min and 18 secs
  • B
    2 min and 30 secs
  • C
    1 min and 18 secs
  • D
    1 min and 30 secs

Rate of descend (ROD) is a vertical speed and represents the rate of decrease of the vertical height per unit of time, usually expressed in feet per minute (ft/min):

1. The helicopter descends from 7 000 ft to 5 500 ft, thus the height difference is: 7 000 ft - 5 500 ft = 1 500 ft.

2. Therefore, the time required to descend is: Height difference / RoD = 1 500 ft / 650 ft = 2.3 min or 2 min and 18 secs.

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